ATI Pathophysiology

Correct Answer: C

Rationale: Spinal muscular atrophy (SMA) is an inherited disorder, often autosomal recessive, that affects lower motor neurons.

Correct Answer: A

Rationale: Progestin-only contraceptives are preferred in women who are at increased risk of thromboembolic events, such as those with a history of blood clots.

Correct Answer: B

Rationale: Erectile function is primarily controlled by the parasympathetic nervous system, which facilitates the dilation of blood vessels in the penis. The parasympathetic nerves are responsible for vasodilation in the penis, allowing blood to enter and creating an erection. Sympathetic nerves, on the other hand, are responsible for ejaculation by causing contraction of the muscles around the vas deferens. Somatic nerves are involved in sensation and movement, not specifically in controlling blood supply to the penis. Spinal reflexes can play a role in the erectile process, but they are not directly responsible for controlling the venous blood supply.

Correct Answer: B

Rationale: Sildenafil should not be used by patients taking nitrates, as the combination can lead to severe hypotension.

Correct Answer: C

Rationale: Progestin-only contraceptives are less likely to cause hypertension compared to combined oral contraceptives and may be preferred in women with cardiovascular risk factors.